Gas/liquid separator and components; liquid drain flow assemblies; systems of use ; and, features; and, components

ABSTRACT

According to the present disclosure gas/liquid separator assemblies, such as crankcase ventilation filter assemblies, and components are described. Also described are liquid flow control arrangements for facilitating liquid flow from a region of first effective pressure to a region of second higher effective pressure are described. In examples, the flow control arrangements are configured so they can be used in association with a gas/liquid separator, managing separation of liquids from crankcase ventilation gases, for example for internal combustion engines. Example arrangements are described, used with crankcase ventilation gas filter assemblies. Combinations of equipment, and various components usable in those combinations, are described.

This application is being filed on 27 Jul., 2012, as a PCT InternationalPatent application in the name of Donaldson Company, Inc., a U.S.national corporation, applicant for the designation of all countriesexcept the US, and Gert Willem, a citizen of Belgium, and KrystufekMiloslav, a citizen of the Czech Republic, applicants for thedesignation of the US only.

CROSS-REFERENCE TO RELATED APPLICATIONS

The application includes the content of, with edits, U.S. Ser. No.61/513,207, filed Jul. 29, 2011. The complete disclosure of U.S. Ser.No. 61/513,207 is incorporated herein by reference. A claim of priorityis made to U.S. Ser. No. 61/513,207 to extent appropriate.

FIELD OF THE DISCLOSURE

The present disclosure relates to methods and equipment for directingflow of liquid between regions of different internal pressure. Thesystems, methods, assemblies, features and components described, areparticularly well configured to provide convenient flow (of collectedcoalesced liquid, such as oil) from crankcase ventilation gas/liquidseparation assemblies to a crankcase of an associated engine, althoughalternate applications are possible. The disclosure includes componentsfor use with such system.

BACKGROUND A. Liquid Drain Flow Between Regions of Different Pressure

In a variety of systems, it is desirable and/or necessary to cause aliquid drainage flow to occur between regions of different internalpressure. This can pose issue, when liquid begins in a region ofrelatively low pressure and must flow to a region of relatively higherpressure. Herein, methods, techniques and equipment are provided tofacilitate such flow.

A typical example application is in connection with a gas/liquidseparator such as a gas/oil separator for managing crankcase ventilationgases, from a crankcase of an engine such as a diesel engine. Ingeneral, crankcase ventilation gases comprise a gaseous component havingsuspended therein, liquid oil. After removal from the crankcase, the oilparticles are coalesced and drained.

A variety of systems for managing crankcase ventilation gases andseparating them between the gaseous and liquid components are known.Examples include, for example, coalescer and inertia separators;electrostatic separators; cyclones; rotating coalesers; axial vortextube separators; cone-stack centrifuges and, spiral vane centrifuges.

In general, in many systems for managing crankcase ventilation gases,once the liquid is separated from the gases, it needs to be drained backinto the crankcase or engine sump. This, in many instances, involvesliquid flow from a region of separation which may be a lower pressure,into an engine crankcase that may be a higher pressure. Techniquesdescribed herein were developed specifically to address suchcircumstances.

It is noted that the system for separating crankcase ventilation gasesinto a gas component and a liquid component can be of a variety of typesas indicated. Herein, example systems are described which involvecrankcase ventilation filter assemblies, i.e. assemblies in which theseparation occurs as the gases are passed through a coalescing/filtermedia. The techniques described can be applied, however, in connectionwith alternate systems for managing crankcase ventilation gases.

B. Crankcase Ventilation Filter Assemblies Generally

Certain gas streams, such as engine blowby gases i.e. crankcaseventilation gases from the crankcase of diesel engines, carrysubstantial amounts of entrained oils (liquid) therein, as aerosol. Insome instances, many of the oil (liquid) droplets within the aerosol arewithin the size of 0.1-5.0 microns. In addition, such gas streams canalso carry substantial amounts of fine particulate contaminants, such ascarbon contaminants. Such contaminants often have an average particlesize within the range of 0.5-3.0 microns.

In some instances, it is desired to vent such gases to the atmosphere.In general, it is preferred that before the gases are vented to theatmosphere, they be cleaned of a substantial portion of aerosol and/ororganic particulate contaminant therein.

In other instances it is desirable to direct the filtered gas streaminto equipment. When such is the case, it may be desirable to remove (orreduce levels of) aerosolized liquid and/or particulate from the gasstream during circulation, in order to provide such benefits as: reducednegative effect on downstream equipment; improved efficiency; recaptureof otherwise lost oil; and/or to address environmental concerns.

Crankcase ventilation filter systems usable in a variety of equipmentsystems to accomplish this are well known. Examples are described in PCTWO 2007/053411 A2; WO 2008/147585 A2; WO 2008/115985 A2; WO 2008/157251A2; WO 2009/018454 A2; U.S. Ser. No. 61/425,869; U.S. Ser. No.61/503,008; and, in U.S. Ser. No. 61/503,063, each of which isincorporated herein by reference.

C. Example Engine Systems Including a Crankcase Ventilation Gas/LiquidSeparator Assembly

In FIG. 1, an example system 1 using a crankcase ventilation gas/liquidseparator assembly is depicted. Referring to FIG. 1, at 3 an enginesystem is depicted, comprising for example, an internal combustionengine such as a diesel engine for a vehicle such as a truck, or forconstruction or farm equipment, etc. At 4 is a depicted a vent outletfrom the engine 3, for crankcase ventilation gases. At 5 a crankcaseventilation gas/liquid separation system is depicted. The crankcaseventilation gases are directed into the system 5 via the line indicatedat 4 x. At 6, a coalesced or collected liquid drain take-off for liquidfrom the crankcase ventilation gases is shown. In line 6, the liquiddrain would be of oil(s) coalesced within the system 5, and removed fromthe gas. At 7 a gas take-off from the gas/liquid separator system isshown. The particular system 1 depicted is a closed system. Thus, thegases at outlet 7 are shown directed, via line 8 into an air inductionsystem 9 for the equipment of use. In some systems, the gases fromoutlet 7 may be vented to the atmosphere, as shown at optional line 8 x.

At 10, an air cleaner for induction air from line 11 is depicted. At 12,a filtered air outlet from the air cleaner 10 is shown, directingfiltered air into turbo 13 and to engine 3 via line 14.

The system 5 used for separating crankcase ventilation gases from line 4into a gas component and a collected or coalesced liquid component, cancomprise a variety of arrangements as indicated above. In certainspecific examples provided herein, the system or assembly 5 is acrankcase ventilation filter system. An example such system is describedin the next section.

D. An Example Crankcase Ventilation Filter Assembly, FIG. 2

In FIG. 2, a side elevational view of a crankcase ventilation filterassembly is depicted. The particular assembly depicted in FIG. 2, is onedescribed in U.S. Ser. No. 61/503,008, incorporated herein by reference.

In general, the crankcase ventilation filter assembly 30 comprises ahousing 31 defining an interior volume and having removably positionedtherein a filter arrangement (not depicted), in the form of aserviceable filter cartridge.

The housing 31 generally includes a gas flow inlet arrangement 34, a gasflow outlet arrangement 35 and a liquid drain outlet arrangement 36.Typically the housing 31 includes a housing body or base 37 and aremovable access or service cover 38.

In operation, crankcase gases are directed from the engine to theassembly 30, via gas flow inlet arrangement 34. Within the housing 31,the gases are passed through filter media of the filter arrangement.Within the media, particulates within the gas flow stream are collected.This generally includes coalescing of liquid oil particles. The gases,after passing through the media, are then directed to the gas flowoutlet arrangement 35. This gas flow may be directed to the airinduction system for the engine system of concern, or be vented to theatmosphere, as discussed above with respect to FIG. 1. Again, when thegases are directed to the air induction system, for example into the aircleaner system, the overall crankcase ventilation filter system may bereferred to as “closed” or “CCV.” When the gas flow is vented to theatmosphere, the overall crankcase ventilation filtration system may bereferred to as “open” or “OCV.”

As described, liquid (oil) that coalesces within the media and willgenerally drain to the liquid drain outlet 36. This liquid is thendirected outwardly from the assembly 30 and preferably back into thecrankcase.

Again, the assembly 30 is intended to represent a variety of exampleprior art assemblies and may vary in specific detail. The features anddescriptions generally described, are typical, alternate assemblieswhich includes features for the same general type of operation aredescribed in PCT WO 2007/053411 A2; WO 2008/147585 A2; WO 2008/115985A2; WO 2008/157251 A2; WO 2009/018454 A2; U.S. Ser. No. 61/425,869; U.S.Ser. No. 61/503,008; and, in U.S. Ser. No. 61/503,063; each incorporatedherein by reference.

With assemblies that include cylindrical media packs and cartridges, theassembly may be configured for either in-to-out flow during filtering orout-to-in flow during filtering. These terms are meant to refer to thedirection of gas flow through the media as the filtration processoccurs, i.e. does it pass through the cylindrical media from a locationwithin the interior of the cylinder through the media to the exterior,or does it pass from exterior of the media through the media tointerior, as the filtration occurs. The identified PCT WO 2007/053411A2; WO 2008/147585 A2; WO 2008/115985 A2; WO 2008/157251 A2; WO2009/018454 A2 and in U.S. Ser. No. 61/425,869 and U.S. Ser. No.61/503,008; include examples of both types of arrangements. A typicalcharacteristic of each is that the housing includes a gas flow inletarrangement, a gas flow outlet arrangement; and, a liquid drainarrangement. It is also noted that in one of the references previouslyidentified, namely WO 2008/147585, an assembly in which the media packis configured as a panel rather than a cylindrical configuration isprovided. Principles described herein can be used in connection with anyof these arrangements and variations thereof.

E. An Issue with Respect to Liquid Drain and Direction Back into theCrankcase

It is noted that with crankcase ventilation gas/liquid separatorassemblies of the type generally characterized herein above, liquid thatis collected drains therefrom into a region or lower pressure, forexample downstream of filter media. That is, such a collection/drainregion is typically of lower pressure than a region upstream of themedia or in the crankcase. Thus, for crankcase ventilation filterassemblies, the filter cartridge (media) and seals associated therewithgenerally separate the housing into: an upstream, relatively higherpressure, region; and, a downstream, relatively lower pressure, region.The upstream, relatively higher pressure, region is generally a regionthat receives gas flow from the crankcase, and thus reflects thecrankcase internal pressure. The downstream, relatively lower pressure,region is, in closed systems, a region in communication with downstreamair induction equipment, and is subject to the intake air draw of theengine air induction system.

Issues relate to accomplishing effective liquid drain from liquidcollected in a relatively lower pressure region being drained to acrankcase having a condition of generally higher pressure. Principlesaccording to the present disclosure are provided to affect this.

SUMMARY

According to an aspect of the present disclosure, equipment andtechniques are described for managing liquid flow from a region ofrelatively low pressure to a region of relatively higher pressure.Typical applications involve management of liquid flow from a crankcaseventilation system gas/liquid separator. The liquid separated isdirected back into the crankcase of an engine, typically from a regionof lower pressure than the crankcase. The equipment and techniquesdescribed herein facilitate this drainage, i.e. this flow control.

A flow control arrangement in accord with the techniques describedherein can be managed in accord with a variety of specific equipmentconfigurations. In general, a flow transition chamber is provided,between a region of relatively lower pressure and the region ofrelatively higher pressure. Various valve arrangements are used to cyclethe transition region between filling with liquid from a lower pressureside and draining liquid to the higher pressure side.

In addition to liquid flow control arrangement components and featuresthereof, the present disclosure also includes an aspect relating toselected identified combinations of gas/liquid separator assemblies andliquid flow control arrangements. The gas/liquid separator assembly maybe of a variety of types, specific examples described comprisingcrankcase ventilation filter assemblies. Also, some example techniques,configurations and components for such arrangements, or for thegas/liquid separator assembly component of such arrangements, aredescribed.

There is no specific requirement that a system, component, assemblymethod or technique include all of the detailed features describeherein, in order to provide some advantage in accord with the presentdisclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of an engine system using a crankcaseventilation gas/liquid separator assembly.

FIG. 2 is a schematic depiction of a crankcase ventilation filterassembly useable in a system in accord with the present disclosure, as agas/liquid separator assembly.

FIG. 3 is a schematic depiction of a engine system using a crankcaseventilation gas/liquid separator assembly and liquid drain flowmanagement arrangement in accord with the present disclosure.

FIG. 3A is a fragmentary schematic depiction of an engine system using agas/liquid separator assembly and liquid drain flow management system inaccord with the present disclosure; the view of FIG. 3A including moredetail for a selected portions than the depiction of FIG. 3.

FIG. 4 is a schematic cross-sectional view of a liquid drain flowcontrol module usable in a liquid drain flow management system in accordwith the present disclosure; the cross-sectional view of FIG. 4 beingtaken generally along line 4-4, FIG. 5.

FIG. 5 is a schematic top plan view of the liquid drain flow controlmodule of FIG. 4.

FIG. 6 is a schematic cross-sectional view generally analogous to FIG.4, depicted with liquid drainage thereto, from a gas/liquid separatorassembly.

FIG. 7 is a schematic view analogous to FIG. 6, depicted with a greateramount of liquid flow into the module depicted, relative to FIG. 6.

FIG. 8 is a schematic view analogous to FIGS. 6-7, shown in a furtherstage of liquid flow in which a drainage flow from the liquid flowcontrol module to the crankcase has started to occur.

FIG. 9 is a schematic cross-sectional view of a portion of a housingcomponent of a liquid flow control module depicted in FIGS. 4-8; theview of FIG. 9 being taken generally along line 9-9, FIG. 10.

FIG. 10 is a top plan view of a housing component of FIG. 9.

FIG. 11 is a schematic cross-sectional view of a top cover component ofthe liquid flow control module depicted in FIGS. 4-8.

FIG. 12 is a schematic side elevational view of a transition chamberfloat valve component of the module directed in FIGS. 4-8.

FIG. 13 is a schematic cross-sectional view of an umbrella valvecomponent depicted in the module of FIGS. 4-8.

FIG. 13A is a schematic depiction of an umbrella valve component mountedin a portion of an assembly for use.

FIG. 14 is a schematic side elevational view of a restriction portfilter component of the assembly depicted in FIGS. 4-8.

FIG. 15 is a schematic cross-sectional view of a second embodiment of aliquid flow control module in accord with the present disclosure; theview of FIG. 15 being taken generally along line 15-15, FIG. 16.

FIG. 16 is a schematic top plan view of the liquid flow control moduleof FIG. 15.

FIG. 17 is a schematic cross-sectional view of a third embodiment of aliquid flow control module according to the present disclosure; the viewof FIG. 17 being taken along line 17-17, FIG. 18.

FIG. 18 is a schematic top plan view of the liquid flow control moduleof FIG. 17.

FIG. 19 is a schematic cross-sectional view of a combination of agas/liquid separator assembly and a liquid flow control module accordingto the present disclosure.

FIG. 20 is a schematic depiction of the assembly of FIG. 19 inassociation with an engine system.

FIG. 21 is a schematic cross-sectional view of a second embodiment of acombination of gas/liquid separator assembly and a liquid flow controlmodule according to the present disclosure.

FIG. 22 is a schematic cross-sectional view of a third embodiment of acombination of gas/liquid separator assembly and a liquid flow controlmodule according to the present disclosure.

FIG. 23 is a schematic depiction of a fourth example of a combination ofa gas/liquid separator assembly and a flow control module according tothe present disclosure.

FIG. 24 is a schematic depiction of an engine system including acombination of a gas/liquid separator assembly and a liquid flow controlmodule in accord with the present disclosure.

FIG. 25 is a schematic depiction of another system including an engine,a gas/liquid separator arrangement and liquid flow control arrangementaccording to the present disclosure.

FIG. 26 is a schematic depiction of another system including an engine,a gas/liquid separator arrangement and a liquid flow control arrangementaccording to the present disclosure.

FIG. 27 is a schematic depiction of another system including an engine agas/liquid separator arrangement and liquid flow control arrangementaccording to the present disclosure.

DETAILED DESCRIPTION I. An Improved Engine System Including a LiquidDrain Flow Arrangement According the Present Disclosure

A. The Engine System and the Liquid Drain System Generally, FIGS. 3 and3A

The reference numeral 50, FIG. 3, generally indicates an engine systemincluding a crankcase ventilation gas/liquid separator arrangement and aliquid drain flow control arrangement in accord with the presentdisclosure. Referring to FIG. 3, at 51 an engine is depictedschematically. The engine 51 includes a lower oil sump 52, depictedhaving oil 53 therein.

Still referring to FIG. 3, at 55 an air induction system for the engine51 is depicted. The air induction system 55 includes air cleaner 56. Ingeneral, air cleaner 56 is configured to filter air being drawn intoengine 51 as combustion air.

At 57 a turbocharger is depicted positioned within the air inductionsystem or arrangement 55 at a typical location relative to the aircleaner 56, i.e. downstream therefrom.

At 58 a crankcase breather exit or crankcase ventilation gas flow exitfrom the engine 51 is depicted. Gases are transferred from the breatherexit 58 through line 59 to a crankcase ventilation gas/liquid separatorassembly 60, which can, for example, be a crankcase ventilation filterassembly 60 f. If a crankcase ventilation filter assembly 60 f is usedas separator 60, it can be generally in accord with arrangementsdescribed in PCT WO 2007/053411 A2; WO 2008/147585 A2; WO 2008/115985A2; WO 2008/157251 A2; WO 2009/018454 A2; U.S. Ser. No. 61/425,869; U.S.Ser. No. 61/503,008; and, in U.S. Ser. No. 61/503,063; or, variationstherefrom, although alternatives are possible. In general, as describedabove for the example assembly of FIG. 2, the gas/liquid separatorassembly 60 includes a gas flow inlet arrangement 61, gas flow outletarrangement 62 and a liquid drain outlet arrangement 63.

The particular system 50 depicted is a closed system with respect to thecrankcase ventilation filter gases. Thus, gas flow from outletarrangement 62 is being depicted directed into line 65 and back into theair induction system 55 at 66; in the example depicted the location 66being downstream of the air cleaner 56 and upstream of the turbocharger57, although alternatives are possible.

In general, liquid drainage from liquid drain outlet 63 is directed vialine 70 eventually back into the sump 52, as shown at 71.

In general, the pressure at line 59 reflects the crankcase pressure ofthe engine 51, whereas the pressure at line 65 reflects a lower pressure(for example a downstream side pressure of the filter assembly 60 f,affected by the gas (air) draw of the air induction system 55).Typically, an effective pressure at line 59 will be higher than aneffective pressure at line 65; line 65 being subject to gas intake drawfrom the engine 51.

Within the gas/liquid separator assembly 60 in the example crankcaseventilation filter assembly 60 f, two regions of different pressure arecreated. For a crankcase ventilation filter assembly 60 f, these areupstream and downstream of an associated filter cartridge 72. Typically,the liquid at drain 63 receives liquid from a location downstream of anupstream most portion of filter cartridge 72 and the assembly 60 andthus generally reflects a region of pressure analogous to the outletarrangement 62, i.e. lower than inlet 61.

However, the sump 52 within the engine 51 generally reflects the enginecrankcase pressure, which is higher and more indicative of the pressureat line 59 and at the gas flow inlet arrangement 61. An issue then isgetting good flow of liquid from the liquid drain outlet arrangement 63into a relatively higher pressure sump 52 within the engine 51.

To provide for this, a liquid drain flow management (or control) system75 is provided. Such a liquid drain flow management system 75 isdepicted schematically in FIG. 3A.

Referring to FIG. 3A, the liquid drain flow management system 75 can beunderstood to comprise: a first (one-way) flood valve arrangement 77 formanaging liquid flow into the liquid drain flow management system 75from the liquid drain outlet 63 of the crankcase ventilation gas/liquidseparator assembly 60 and inhibiting a backpressure or back flow frombeing transferred thereto; a second one-way flood valve arrangement 78configured to facilitate liquid drainage from the liquid drain flowmanagement system to the sump 52 and inhibiting backflow from the sump52 into the liquid drain flow management system 75; and, a third valvearrangement 80 configured to move between two positions: (1) a first inwhich liquid drain flow entering flow module 81 from the crankcaseventilation gas/liquid separator assembly 60 is facilitated (while theequipment inhibits that liquid from draining to the sump 52); and, (2) asecond position in which liquid flow from the gas/liquid separatorassembly 60 is inhibited (but the equipment facilitates liquid drainagefrom the module 81 to the sump 52).

In general, as the third valve arrangement 80 is converted between thetwo extreme positions identified, internal pressure conditions withinselected portions of the flow module 81 are modified between twoextremes, a lower pressure extreme when the third valve arrangement 80is in the first position; and, a higher pressure extreme when the thirdvalve arrangement 80 is in the second position. This will be understoodfrom further description below.

For the example liquid drain flow management arrangement 75 depicted, afloat valve arrangement is used as the third valve 80. This is aconvenient, inexpensive, type of assembly. It is noted that alternatearrangements can be used in accord with principles according to thepresent disclosure.

B. An Example Drain Flow Management System—FIGS. 4-7

An example usable liquid drain flow management arrangement in accordwith the principles for arrangement 75 can be understood by review ofthe liquid drain flow control module 81 depicted in FIGS. 4 and 5.

More specifically, in FIG. 4 a schematic cross-sectional view isprovided of a liquid drain flow module 81 usable as a liquid drain flowmanagement arrangement 75, FIGS. 3 and 3A. The view is taken along line4-4, FIG. 5 (a top schematic view).

Referring to FIG. 4, flow module 81 depicted comprises a housing 82having a liquid drain flow inlet 83, a liquid drain flow outlet 84, afirst gas pressure tap or port 85; and, a gas (crankcase) pressure tapor port 86. The housing 82 is configured to define a first internalvolume or transition chamber 87. In the example depicted the housing 82also defines a second internal drain chamber 88, in this examplecomprising a portion of a housing bottom 88 b, although alternatives arepossible. The module 81 includes a valve member arrangement 95 moveablypositioned in the internal chamber 87, as the third valve arrangement80.

In the particular assembly 75 depicted, at 96 a flood valve arrangementthat corresponds to the first valve arrangement 77, FIG. 3A is depicted;and, at 97 a valve arrangement corresponding to the second drain valvearrangement 78, FIG. 39 is depicted. That is, for the particularassembly 75 depicted, the first valve arrangement 77 and the secondvalve 78 referenced above, with respect to general operation inconnection with FIG. 3A, are incorporated into the module 81 as valvearrangements 96 and 97. Alternatives are possible.

Operation of the flow module 81 will be understood by reference to FIGS.4-8.

Still referring to FIG. 4, when module 81 is installed for typicaloperation liquid flow inlet 83 is configured to receive liquid from thecrankcase ventilation gas/liquid separator assembly liquid flow outlet63, FIG. 3A. Tap 85 is provided in gas flow communication with a lowerpressure gas region, for example a downstream side of filter media ofcrankcase ventilation filter assembly 60 f, FIG. 3A. (For example it canbe in communication with line 65). Tap 86 is provided in gas flowcommunication with crankcase ventilation gas region of higher pressure,for example upstream of a crankcase ventilation gas/liquid separatorassembly 60. Such a communication can be provided by communication withline 59, FIG. 3.

Referring again to FIG. 4, the assembly 81 is depicted as it wouldappear before liquid has begun to drain into the housing 82. In anexample application with a filter assembly 60 f as the gas/liquidarrangement assembly 60, the pressure at inlet 85 can correspond to thedownstream pressure of the crankcase ventilation filter assembly 60affected by the engine induction system draw. In the same, example,application, the pressure at region 86 can correspond to the crankcasepressure. Flow module 81 is depicted configured so that generally theliquid flow inlet 83 is isolated from the higher pressure region 86.Valve 96 is an openable one way valve, for example an umbrella valve.There is no current liquid flow shown in FIG. 4 and valve 97 is depictedclosed generally due to the higher pressure in region 88 than intransition chamber 87.

Still referring to FIG. 4, it is noted that should the inlet gases fromthe crankcase at tap 86 include any liquid therein; the liquid can drainto the bottom of chamber 88 and into outlet 84, without needing to passinto the transition chamber 87 or through the valve arrangement 97.

Referring to FIG. 4, a second gas flow tap or aperture arrangement 100is depicted providing some gas flow communication into transitionchamber 87; i.e. from inlet 89 to tap 85. In the example depicted, eachof tap 85, and aperture arrangement 100 are positioned at a locationabove valve 95 when the valve is in the first orientation depicted inFIG. 4, although alternatives are possible. Aperture 100 is showncovered by optional filter member 101. Preferred aperture 100 and filter101 arrangements are discussed below.

In FIG. 6, the flow module 81 is depicted with liquid drain beginning tooccur from the crankcase ventilation gas/liquid separator assembly. Theliquid (dark cross-hatch) is shown filling inlet 83 and draining througha flow aperture arrangement 103 managed by one way (flood) valvearrangement 96 into an interior 87 i of transition chamber 87. Theliquid is generally isolated in transition chamber 87 (from bottom 88 b)as the float valve 95 begins to rise, with valve arrangement 97 closed.

As the liquid begins to fill (flood) transition chamber 87, it willeventually reach a point where the float valve 95 significantly rises.The float valve 95 will eventually float up to a top position closingoff tap 85 at valve seat 110. Whether the closing is complete or partialis a matter of choice. Both can be configured to operate. Herein, whenthe float valve 95 is positioned to engage tap 85, and valve seat 110,the valve member 95 will be characterized as being in a position inwhich the valve seat of the first gas flow conduit is inhibited from gasflow therethrough. Whether this inhibition is in complete closing orpartial closing, again, is a matter of choice.

In FIG. 7, sufficient liquid volume rise leading to this closing effectis depicted. Referring to FIG. 7, float valve 95 is shown having risensufficiently, due liquid entry into the interior chamber 87 from inlet83, such that valve head 111 on valve member 95 inhibits (closes) gasentry through valve seat 110 to tap 85. Pressure within region 86 (dueto gas inlet from bleed aperture 100) can now increase, since tap 85 isclosed and inlet tap 86 and aperture arrangement 100 are not.

Still referring to FIG. 7, it is noted that in the example, internalchamber 87 is configured so that aperture arrangement 100 is positionedabove a highest level of liquid within chamber 87 when valve member 95is raised to its uppermost position. This will be typical.

The pressure increase in transition chamber 87 that results fromarrangement of valve member 95 with seat 110 will allow one way valvearrangement 97 to open. This is depicted in FIG. 8. It is noted that thepressure increase in chamber 87 will also tend to close flood valvearrangement 96.

Referring to FIG. 8, one way valve 97 is depicted open sufficiently toallow liquid to drain into region 88 and to outlet 84. When this occurs,valve member 95 will drop, opening seat 110 and returning thearrangement to the orientation generally shown in FIGS. 4 and 6. Theoperation will, of course, cycle.

Thus, the assembly depicted in FIGS. 4-8 when used in accord with thegeneral characterizations given, facilitates drainage of liquid from arelatively low pressure region of a crankcase ventilation gas/liquidseparator assembly to a relatively higher pressure region of an engineor sump. A valve is used within a housing transition chamber configuredto cycle between orientations to facilitate such drainage to advantage.

The principles can be practiced in a variety of specific arrangements,as can be seen from the following descriptions. In general, a module ispreferred, in which the first, second and third valves are all containedwithin the same assembly, although in some applications, one or more ofthe one way valve arrangements 96 and 97 can be alternately positioned.

C. A More General Characterization of Features and Principles Relatingto FIGS. 4-8

Now that the basic operation of principles depicted in FIGS. 4-8 isunderstood, general characterizations of those features and principleswill be understood. In general, a liquid flow control arrangement isprovided for use in facilitating liquid flow from a region of firsteffective pressure to region of a second, higher, effective, pressure.The liquid filter arrangement can be configured as a flow controlmodule, with all valve componentry included therein, howeveralternatives are possible. With a system including a flow control modulesuch as module 81, FIGS. 4-8, the system can be seen as comprising ahousing 82 including a transition chamber 87 comprising a sidewall 87 sand a transition chamber bottom 87 b. In more general terms, thetransition chamber 87 can be characterized as having a wall or wallarrangement that defines the transition chamber interior 87 i.

The arrangement includes, defined by the transition chamber 87, a liquiddrain outlet aperture arrangement 98 configured for drainage of liquidfrom an interior 87 i of a transition chamber 87.

There is included within the system 81 (i.e. within the module when amodule is used) a transition chamber one-way drainage valve arrangement97 positioned to control liquid drain through the liquid drain outletaperture arrangement from the transition chamber 87.

A first gas flow conduit 85 is configured in gas flow communication withan interior 87 i of the transition chamber 87. The gas flow conduit 85defines a valve seat 110 in the transition chamber 87. The valve seat110 is typically positioned at a location above a maximum or highestoperating liquid height within the transition chamber 87 during normaluse. The term “high operating liquid height” and variants thereof asused herein, is meant to refer to location above a normal height towhich liquid (flood) will reach within the chamber 87 i, during atypical expected operation. It is preferred that the gas flow conduit 85and valve seat 110 not be submerged, as will be apparent from the abovedescription of operation.

A second gas flow conduit 100 is provided in flow communication withinterior 87 i of the transition chamber 87. The second gas flow conduit100 is also typically positioned at a location above the maximum (orhighest expected) normal operating liquid height within the transitionchamber during normal use.

A liquid flow inlet or flood arrangement 103 is provided, allowing forliquid flow inlet into the interior 87 i of the transition chamber 87. Atransition chamber one-way flood valve arrangement 96 is positioned tocontrol liquid flow though the liquid flow inlet arrangement 103 to theinterior 87 i of the internal chamber 87.

The assembly of module 81 includes a transition chamber valvearrangement 95 including a valve member, positioned in the transitionchamber interior 87, movable upon entrance of liquid flow through theliquid flow inlet arrangement 103 to the transition chamber 87 andliquid drain flow from the transition chamber 87 between:

(1) a first position in which both the first gas flow conduit 85 and thesecond gas flow conduit 100 are open; and,

(2) a second position in which the valve seat 110 in the first gas flowconduit 85 is engaged, inhibiting gas flow therethrough; and in whichthe second gas flow conduit 100 remains open.

Generally, the transition chamber one-way flood valve arrangement andthe transition chamber drainage one-way valve arrangement is configuredsuch that:

(1) when the transition chamber valve arrangement is in first position,the one-way flood valve arrangement is configured to facilitate liquidflow into the transition chamber through the liquid flow inlet; and, thetransition chamber one-way drainage valve arrangement is configured toinhibit liquid drainage flow from the transition chamber; and,

(2) when the transition chamber valve arrangement is in the secondposition, the one-way flood valve arrangement is configured to inhibitliquid flow into the transition chamber through the liquid flow inlet;and, the transition chamber one-way drainage valve arrangement isconfigured to facilitate liquid drainage flow from the transitionchamber.

In general, such an operation is facilitated by providing the first gasflow conduit 85 in communication with a region or lower pressure orvacuum draw; and, the second gas flow conduit 100 in communication witha higher pressure volume. An example system depicted, the first gas flowconduit can be provided in gas flow communication with the downstreamside of a crankcase ventilation filter assembly; and, the second gasflow conduit can provided in gas flow communication with an enginecrankcase, although alternatives are possible.

It is noted that in typical and preferred application of the principlesdescribed herein, gas flow through aperture arrangement 100 (the secondgas flow conduit) is restricted. This will generally facilitateoperation of the valve arrangement 95 within the transition chamber 87,as discussed in the next section.

The system or module 81 can include a higher pressure chamber 88separated from the transition chamber 87 and including: (1) an interiorupper volume portion 88 u in gas flow communication with a second gasflow conduit 100; and, (2) an interior lower volume bottom portion 88 bin both gas and liquid flow communication with the liquid flow outlet84. This construction provides that a gas pressure within bottom 88generally reflects the inlet gas pressure at inlet 86.

D. Providing of Restriction to Gas Flow Through the Second Gas FlowConduit 100 from the Interior Volume Portion of the Higher PressureChamber 88, to the Interior 87 i of the Transition Chamber 87

In general, as indicated above, it is preferable provide for somerestriction of gas flow into the transition chamber 87, from the higherpressure region defined by the interior volume portion 88 u of thehigher pressure chamber 88 through the second gas flow conduit 100. Thereason for this is that a restriction of gas flow through the second gasflow conduit 100 can help ensure that the draw through the first gasflow conduit 85 is substantial, which facilitates liquid enteringinterior 87 i through the one-way flood valve arrangement 96.

Herein, the second gas flow conduit 100 will be referred to as“restrictive flow port arrangement” when it is provided in some mannerwith restriction to gas flow therethrough, from upstream regions.

A variety of techniques can be used to provide restriction with respectto gas flow through the second gas flow conduit 100. These techniquescan be used separately or together. An example technique is to provide afilter arrangement 101 over the aperture 100. Filter media of the filterarrangement 101 will provide for restriction to gas flow throughaperture 100. Referring to FIG. 6, a filter arrangement 101 is shownpositioned under internal flange 115 and over aperture 100. The flange115 covers the media 101 and ensures that liquid entering throughaperture 86 does not directly fall upon the media 101.

Another manner of restricting flow through aperture 100 is byrestricting the size of aperture arrangement 100 for gas flowtherethrough. The size of aperture arrangement 100 in this context ismeant to refer to the cross-sectional size. Typically, the aperture 100will be circular in cross-sectional dimension, but alternatives arepossible. When more than one aperture is used as the aperturearrangement 100, the general reference is to the total cross-sectionalsize.

Typically, the total cross-sectional size of aperture arrangement 100 isnot greater than 13 sq. mm, usually not greater than 7 sq. mm, and oftennot greater than 4 sq. mm. Typical example arrangements for aperturearrangement 100 will comprise a single aperture having a diameter on theorder of about 1-2 mm.

Another way of characterizing the amount of restriction, is to refer tothe flow aperture 100 as a pilot flow, relative to the flow in line 59,FIG. 3A. Typically, the flow in the tap 86, FIG. 4, and through aperture100, should be no more than about 0.1% of the gas flow exiting thecrankcase via the crankcase ventilation arrangement, typical no morethan 0.05% of that flow, and preferably no more than 0.04% of this flow.

E. Assembly of Drain Flow Management System 75—FIGS. 9-14

In FIGS. 9-14, componentry 82 usable to form module 81 is depicted. InFIG. 9, depicted are: housing section 116 with housing bottom 117secured thereto. The housing section 116 and housing bottom 117 can beseparately made, and then be secured to one another. The securement canbe a permanent attachment such as through sonic welding, or it can be adisconnectable attachment.

The housing section 116 for the example assembly depicted includes threeregion. The first is (internal) transition chamber 87 referenced above.The second is high pressure region 88 comprising, together, tap 86,associated down corner 86 x and bottom region 88 with outlet 84 incommunication therewith. The third is liquid flow inlet 83 withdowncomer 83 x associated therewith.

Downcomer 83 x communicates with interior 87 through flow aperturearrangement 103. A one-way valve arrangement 96 discussed above will beassociated with aperture arrangement 103 to control flow from downcomer83 x into interior 87 as discussed above.

Aperture 100 discussed above, provides communication between downcomer86 x and interior chamber 87. The frame 115 depicted includes a top 115x and sidewall 115 y positioned to receiver filter arrangement 101discussed above therein, over aperture 100 and to protect filterarrangement 101 from material dripping thereon, from inlet 86.

Transition chamber 87 is generally defined by sidewall 87 s and bottom87 b. The bottom 87 b includes an aperture arrangement 98 therethroughwhich allows drainage from region 87 into lower region 88. Aperture 87 tprovides for mounting one way valve assembly as discussed previously andas referenced in more detail below.

The sidewall 87 s can have a variety of shapes. The particular exampledepicted is a generally cylindrical shape with a plurality of spacedvertical valve centering ribs 87 r therein. The region 87 wouldtypically include at least four ribs 87 r, typically 4-8 such ribs 87 r.The ribs 87 r generally help center float valve 95 within the assemblywhen used as discussed below. It is note that the ribs 87 r depictedterminate at upper ends below aperture 100. This is preferred, butalternatives are possible.

In FIG. 10, a top plan view of the housing portion viewable in FIG. 9 isshown. Features already described generally include: aperture 87 t,drain arrangement 98; transition chamber 87; inlet 86; downcomer 86 x;liquid inlet 83; downcomer 83 x and ribs 87 r.

In FIG. 11, a top or cover 120 for housing 82 is depicted. The cover 120would be secured to upper edge or ledge 121, FIG. 9, when flow module 81is assembled. Cover 120 includes an outer flange or lip 125 which can besecured to edge 121, for example permanently with an adhesive or sonicwelding operation. Top 120 includes port 85 therethrough, and a valveseat 110 positioned along an interior 120 x of the cover 120. The valveseat 110 is sized and positioned so that in use it will be positioned inchamber 87 at a location to engaged by a float valve and be at leastpartially closed when the float valve is used in accord with thedescription above for FIGS. 4-8.

In FIG. 12, a usable float valve or valve member, for member 95 isdepicted. The float valve member 95 includes an upper end 130 havingvalve closure member or projection 131 thereon. The closure 131 is sizedand shaped so that as the valve member 95 rises within the housing 82,member 131 will eventually engage and close valve seat 110, FIG. 11. Forthe particular example depicted, the valve projection 131 has a roundedend for engagement with the seat 110, although alternatives arepossible.

The valve member 95 depicted, includes an (optional) outwardly directedradial flange 133 adjacent end 130. The flange 133 is sized andpositioned to be located above ribs 87 r, FIG. 9, when installed, seeFIG. 4. The valve 95 includes a sidewall 135 and bottom 136.

Typically the valve member 95 is sized and shaped to fit within region87 appropriately, centered by the ribs 87 r, and to rise and fall asliquid enters and leaves internal chamber 87, in accord with thedescribed intended operation.

In FIG. 13, a valve member 140 usable as one-way valve 96 and one wayvalve 97 is schematically depicted. The valve member 140 is an umbrellavalve, which mounts within an aperture by post 141. An umbrella portion142 is sized and shaped to fit over flow aperture(s) within theassembly, generally over a downstream end thereof, to substantiallyclose those aperture(s) or open them selectively, as it flexes in use.

In FIG. 13A a schematic depiction of an umbrella valve member 148inserted in an aperture 143 is depicted, controlling flow throughaperture 144.

Umbrella valve arrangements can be made from a variety of materialsincluding, for example, EPDM; silicone rubber; fluorosilicone materials;and, FKM (fluoroelastomers, sometimes referenced as FPM).

In FIG. 14, a filter member is depicted, usable as member 101, FIG. 4,by insertion into a receiver region 150, FIG. 9, surrounded by flange115 y and underneath shelf 115 x. The shelf 115 x and flange 115 y helpprevent liquid carried through tap 86 from directly impinging the filter101. The filter 101 adds to restriction by being positioned overaperture 100 and also helps prevent material carried within gasesentering tap 86 from flowing through port 100 and entering chamber 87.

II. Example Additional Embodiments, FIGS. 15-18

The techniques described herein can be applied in a variety of forms.For example, alternate configurations of the stand alone module forliquid drain management are possible. Also, the principles can beapplied in a housing in which the flow control module is secured to acrankcase ventilation gas/liquid separator assembly. Some examples ofalternate module configurations are shown in FIGS. 15-18.

A. An Example Alternate Module Configuration with a Side-by-SideArrangement of One Way Valves, FIGS. 15-16

Attention is directed to FIGS. 15 and 16 in which an alternate geometricconfiguration of a liquid drain management (or flow control arrangement)operable in accord with the principles described herein above isdepicted. FIG. 15 is a cross-sectional view taken generally along line15-15, FIG. 16.

Referring to FIG. 15, a liquid drain flow management system orarrangement 200 is depicted. Similarly, to unit 81, FIG. 4, unit 200comprises a module 201 comprising a housing 202. The housing includes aliquid drain inlet 203, an inlet downcomer 203 x; a first gas pressuretap 205 with a valve seat 205 x associated therewith; and, a highpressure side gas inlet 207, in communication with second gas flow inletor tap 226.

The housing 202 defines an internal transition chamber 210 in which ispositioned float valve 211. The transition chamber 210 includes by awall defining an internal sidewall 212 and bottom 213. The housing 202is separated into regions exterior to internal chamber 210 and withinthe two channels 203 x, 207 x. The channels are separated by inner wallor divider 215. Region 207 x, which is direct flow communication withtap 207, is also in direct flow with liquid drain outlet 216.

At 218 a liquid flow (flood) aperture arrangement to the transitionchamber 210 is depicted, providing for flow communication betweendowncomer 203 x and an interior of chamber 210. Flow through aperturearrangement 218 is managed by one-way flood valve arrangement 219.

At 220 a liquid flow transition chamber drain aperture arrangement isdepicted providing for liquid flow communication between an transitionchamber 210 and a lower portion of downcomer 207 x, allowing for liquiddrainage from transition chamber 210, i.e. to liquid drain 216. Flowthrough aperture arrangement 220 is managed by one-way transitionchamber drain valve arrangement 221.

Float valve 211 is configured with a hat or valve closure portion 225configured and positioned so that as float valve 211 rises in chamber210, valve 225 will eventually engage valve seat 205 x, inhibiting gasflow through tap 205.

Sidewall 212 includes pilot aperture or gas tap arrangement 226therethrough, allowing for gas flow between region 207 x and theinterior the transition chamber 210. Aperture 226 is covered by filterarrangement 227 secured within frame 228.

Operation of arrangement 201 is analogous to operation of assembly 81.The principal difference relates to the location of the flood (inlet)aperture arrangement 218 so that liquid flow into chamber 210 is at alocation generally underneath the float valve 211, and such that thevalve members 209 and 221 operate side-by-side. The differences fromarrangement 81, FIG. 4, generally relate to extending downcomer 203 x toa location underneath chamber 210 and providing the divider wall 215appropriately.

In operation then, liquid will enter module 201, i.e. housing 202,through inlet 203. As liquid enters, it will flow through inlet aperturearrangement 218, managed by one-way flood valve 219, which will openunder the influence of liquid flow and allow that flow into chamber 210.Liquid rise in chamber 210 will drive float 211 upwardly until head 225seals aperture 205 a. This will inhibit gas flow through pressure tap205, which is generally a low pressure side pressure tap analogous topressure tap 85, FIG. 4. When this occurs, bleed through aperture 226will eventually raise the pressure in chamber 210 sufficiently so thatthe drain valve 221 can open and liquid can drain through aperturearrangement 220 into a lower portion of downcomer 207 x and outwardlyfrom the assembly 201 through drain 216. As this occurs, the float valve211 will lower, reopening valve seat 205 x. Also, as pressure in chamber210 increases, flood valve 219 will have closed.

It can be seen from a review of FIGS. 15 and 16 that although analogousoperation of the arrangement of FIGS. 4-8 is shown, the assembly 200 canbe provided with different specific configurations and features. This isa general observation, and many alternatives are possible.

B. A Second Alternate Embodiment, FIGS. 17 and 18

In FIGS. 17 and 18, a third (second alternate) embodiment is depicted,using many principles generally analogous to those of the embodiments ofFIGS. 15 and 16. In FIG. 17, a cross-sectional view is taken generallyalong line 17-17, FIG. 18.

Referring to FIG. 17, the liquid flow control management system 250 isalso shown in a form of a module 251 comprising a housing 252 having aliquid inlet 253, a first low pressure side gas flow outlet or tap 254and a high pressure side gas flow inlet or tap 255. The housing 252includes a lower liquid drain outlet 256.

The housing 252 defines an inlet chamber or downcomer 253 x for liquidentering module 251 (housing 252); and, a chamber or downcomer 255 xfrom high pressure side inlet 255 in direct communication with liquiddrain outlet 250. The drain outlet, then, is in housing bottom region orchamber 258.

The housing defines an internal transition chamber 260 in communicationwith tap 254 through an aperture surrounded by valve seat 254 x. Thechamber 260 is defined by sidewall 261 and a bottom 262. Liquid flood orinlet aperture arrangement 264 is in direct flow communication withdowncomer 253 x and provides for liquid flow from downcomer 253 x toenter chamber 260. Flow through inlet aperture arrangement 264 ismanaged by one-way flood valve arrangement 265 which, in the exampledepicted, comprises a ring 265 r and is positioned coaxially with asecond valve member as discussed below. Divider wall 267 prevents liquidentering inlet 253 from directly reaching liquid drain outlet 250without passage into transition chamber 260.

At 270 a liquid drain outlet arrangement from transition chamber 260,into a lower portion of downcomer 255 x and drain 250 is shown, withliquid flow through transition chamber drain outlet or aperturearrangement 270 managed by one-way drainage valve arrangement 271.

At 273, a second port or gas flow (tap) aperture in communication withto an interior of transition chamber 260 is shown. The aperture 273 isin gas flow communication with inlet 253, with filter 273 (secured byframe 275) positioned thereover.

Operation will be generally analogous to the units described withrespect to FIGS. 4-8; and 15-16. Liquid will enter through inlet 253 andflow through downcomer 253 x until aperture arrangement 274 is reached.The liquid will flow through aperture arrangement 264, opening one-wayflood valve arrangement 265 (by lifting an outer perimeter thereof) andbegin to fill chamber 260. As this occurs, float 280 will begin to riseand eventually valve head 281 will rise and engage seat 254 x,inhibiting gas flow through tap 254. (Tap 254 being a first gas flowconduit in communication with a vacuum draw or low pressure side ofequipment).

When the valve member 280 is floated such that head 281 closes aperture254 x, high pressure side inlet 255 via port 273 will allow pressurewithin chamber 260 to begin to increase. This is what helps liquid flowthrough aperture arrangement 270, controlled by valve member 271 tooccur. As the liquid voids chamber 280, valve member 280 will drop,reopening tap 254. Also, increased pressure in transition chamber 80will tend to close valve 265.

Reviewing FIGS. 17 and 18, in comparison with previously discussed FIGS.15 and 16, it will be understood that operation is generally analogous,the differences relating to specific geometric configuration, and to theseat that in the example of FIG. 17, the valve members 265, 271 arecoaxially positioned. Also, valve member 265 is a half-donut type ringinstead of an umbrella valve.

III. Mounting of the Flow Control Module to the Crankcase VentilationGas/Liquid Separator Arrangement

In the embodiments described above, generally the liquid flow managementsystem was a flow control module that could be positioned on, orseparately from, a crankcase ventilation gas/liquid separator assembly,with equipment for use. There is no specific requirement that the flowcontrol module not be mounted to, or not be, integral with, thecrankcase ventilation gas/liquid separator assembly. Indeed, advantagescan be obtained, when the flow control module is mounted on a gas/liquidseparator assembly. Examples are depicted and described in this section.

A. An Example Embodiment, FIG. 19

Referring to FIG. 19, at 300, an assembly is depicted which includes acrankcase ventilation gas/liquid separator assembly 301 and a liquidflow control arrangement 302 in accord with the present disclosure.These components are “integral” in the example depicted. By “integral”in this context, it is meant that the assembly 300 comprises majorhousing components of the gas/liquid separator arrangement 301 andliquid flow control arrangement 302 mounted to one another. Thus, forexample, the assembly 300 can be shipped and installed as a unit.

Still referring to FIG. 19, the assembly 300 is depicted as having agas/liquid separator assembly 301 that comprises a crankcase ventilationfilter assembly 303. It is noted that the principles can be practicedwith alternate types of gas/liquid separator assemblies.

Attention is first directed to the filter assembly 303. The filterassembly 303 generally comprises a housing 305 comprising a housingbottom 306 defining an interior 307; and a removable access or servicecover 308.

Positioned within an interior 307 is a serviceable filter cartridge 310,in the example depicted comprising media 311 surrounding an open filterinterior 312. The example cartridge 310 depicted comprises media 311positioned between end pieces 313, 314 and around central support 315.The cartridge 310 is removably sealed within housing 300, by seal 316.

By “serviceable”, it is meant that the cartridge 310 can be removed fromhousing 300 and be replaced, without damage to either the housing orcartridge, i.e. it is a removable and replaceable service component. Forthe example depicted, end piece 313 will typically be an upper end pieceand end piece 314 will typically be a lower end piece, in installation.

The housing 305 defines a gas flow inlet arrangement 320 and a gas flowoutlet arrangement 321.

In operation, gas to be filtered enters housing interior 307 through gasflow inlet 320. It passes through the media 311. Within the media 311the gases are filtered, and liquid carried within the gas is coalesced.The coalesced liquid drains to a bottom 323 of housing 305 and throughlower liquid drain outlet 324. As the gas reaches interior 312 it canpass upwardly through end piece 313 past regulator valve arrangement 326and to gas flow outlet 321.

Typically, gas flow inlet 320 would receive gases from a crankcase andbe subject to crankcase pressures. Typically, outlet 321 would beconnected to an air induction system (if CCV), and thus there would be avacuum drawn at outlet 321.

Still referring to FIG. 19, at 328, a tap from inlet 320 is shown,directed to liquid drain management arrangement 302. The tap 328, then,is in direct gas flow communication with the engine crankcase and issubject to the pressures thereof. The tap 328 can be viewed as being incommunication with an interior of housing 305 at a location of highpressure (or high pressure region), i.e. upstream of cartridge 310.

Referring to liquid drain management arrangement 302, housing section330 is depicted. The housing section 330 is secured to housing base 305underneath bottom 323. The housing section 330 defines an interiortransition chamber 331 in which float valve 332 is positioned.

In general, the features of liquid drain management arrangement 302depicted are generally analogous to those of the arrangement of FIG. 4-8except the housing 330 is depicted mounted on a crankcase ventilationgas/liquid separator assembly 301. Liquid flow conduit 324 communicateswith an interior of housing 302 via the downcomer 324 x. Interiorchamber 331 can receive liquid flow from downcomer 324 x via flowaperture arrangement 334 managed by a first one-way (flood) valvearrangement 335. Liquid drain from transition chamber 331 to liquiddrain outlet 336 is by flow through transition chamber drain aperturearrangement 337 managed by one-way transition chamber drainage valvearrangement 338.

The assembly 302 includes a low pressure side tap 340 defined in part byvalve seat 340 x. Tap 340 is in gas flow communication with the housing304 at a lower pressure region downstream of the media 311 and thus issubject to downstream pressure conditions with respect to the media 311and the draw at outlet 321. The float valve 332 includes a head 341sized such that as the float valve 332 rises, the valve head 341 willeventually engage seat 340 x, inhibiting gas flow therethrough.

Housing 330 includes high pressure side tap 345 configured to receivegas flow and pressure conditions directly from inlet 320 and thecrankcase itself, via line 326.

The internal chamber 331 defined by sidewall 350 includes second gasflow part or pressure tap 351 therethrough over which is positionedfilter 352 secured by frame 353.

It is noted that low pressure tap 340 extends to a location above ahighest expected normal liquid collection height within a bottom 323 ofhousing 305, so that liquid does not drain through tap 340, but ratherthrough outlet 324, from housing 305. Typically, tap 340 will comprise aprojection 340 p having a conduit therethrough (i.e. a conduitprojection 340 p) that extends upwardly within housing 306 to a locationsurrounded by media 311 of the cartridge 310. In some instances, thiswill involve extension through a central aperture (see aperture 314 a,in the lower end piece 314). However as will be apparent from otherembodiments described herein below, in some instances the end piece 314will not have a central aperture 314 a therethrough, but rather willhave a closed section extending across open filer interior 312. In atypical arrangement, the projection 340 p defining tap 340 with aconduit therethrough, will extend at least 5 mm, typically at least 8 mmand often at least 10 mm upwardly into an interior of the housing 305.The projection 340 p may extend considerably further if desired, forexample, 20 mm or more.

Operation is as generally previously described. Liquid draining from thecrankcase ventilation filter assembly 303 through drain aperture 324well enter downcomer 324 x and flow through aperture arrangement 334(managed by one-way flood valve arrangement 335) into transition chamber331. As this occurs, float 332 will begin to rise and eventually valve341 will engage valve seat 340 x, inhibiting gas flow through tap 340;the tap 340 being in gas flow communication with a downstream side ofthe filter cartridge 311, and being subject to the draw at outlet 321.With the valve seat 340 x closed, bleed through aperture 351 will allowfor a higher pressure condition within chamber 331 and liquid drainthrough aperture arrangement 337 managed by valve member 338. Thisliquid drain will lead the assembly 301 via drain outlet 336. Higherpressure in transition chamber 331 will tend to close flood valvearrangement 335. As the liquid level lowers, valve member 332 will beginto lower, opening valve seat 340 x closing valve 338 and again allowingdrainage to occur from drain 324 via downcomer 324 x into chamber 331,with the cycle repeating as the system is operated.

In FIG. 20, a schematic depiction of the assembly 300 is provided, in anengine system indicated generally at 370. Referring to FIG. 20, inassembly 370, the engine is indicated at 371. At 372, a vent forcrankcase gases is shown, directing those gases via line 373 to inlet320 of a gas/liquid separator assembly generally in accord witharrangement 301, FIG. 19. At 321, filtered gas outlet from assembly 301is shown, directed via line 375 back into an air induction system 376 at378. This would be a flow for a closed crankcase ventilation system orCCV. At 379, an alternate outlet path, for example, to the atmosphere,is indicated as an option for an open crankcase ventilation filter (OCV)system.

At 380, the flow control module is shown schematically, generally inaccord with previous figures, see for example FIG. 3A.

It is noted that the filter assembly 303 is configured so that thecartridge 310 can be removed and be replaced or serviced during thelifetime of the equipment. This will be typical when the crankcaseventilation gas/liquid separator assembly is a filter assembly 303.

B. A Second Example, FIG. 21

In FIG. 21, another example system depicting a gas/liquid separatorassembly having a liquid flow control management system mounted thereon,is depicted at 400. As with the example depicted in FIGS. 19 and 20, thegas/liquid separator assembly depicted in FIG. 21, is a crankcaseventilation filter assembly, although alternatives are possible.

Referring to FIG. 21, the assembly 400 depicted, comprises gas/liquidseparator assembly 401 having mounted thereon a liquid flow managementarrangement or flow control module 402. The gas/liquid separatorassembly 401 for the system 400 depicted, comprises a crankcaseventilation filter assembly 403.

The crankcase ventilation filter assembly 403 comprises a housing 404including a removable service cover 405. The housing 404 defines aninterior 404 i having, removably positioned therein, serviceable filtercartridge 407. The cartridge 407 is removably sealed to the housing 404by seal arrangement 407 s.

The housing 404 defines a gas flow inlet 410, a gas flow outlet 411 anda liquid drain outlet 433.

The cartridge 407 comprises media 412 positioned around (and defining)an open filter interior 413. In the example depicted, the cartridge 407is configured with the media 412 oriented surrounding a central support414 in extension between a first and second end pieces 415, 416. In theexample depicted, the seal arrangement 407 s is positioned on an endpiece 415. The end piece 415 has a central gas flow aperture 415 atherethrough, in communication with the open filter interior 413.

End piece 416 is closed in extension across open filter interior 413.That is, end piece 416 includes a central section 416 c that is a closedend that extends across open filter interior 413.

In general, end cap 415 may be sometimes referred to as a “top” or“upper” end cap since it is the end cap directed upwardly in typicaluse. Analogously, end cap 416 will generally be referenced as a “lower”or “bottom” end cap, since it is the end cap generally directeddownwardly.

Still referring to FIG. 21, it is noted that central section 416 c ofend cap 416 includes a central projection portion 416 p which projectsinto open filter interior 413. This creates a recess 416 r forprojection therein of a projection discussed below.

In operation, gases enter inlet 410 from the engine crankcaseventilation vent. The gases are directed through aperture 415 a and intointerior 413 and the gases is directed “in-to-out” through the media412. Liquid coalesced would eventually drain to bottom 420 of housing404. The gases can pass outwardly from the housing via outlet 411, to bedirected to an air induction system, as discussed above, or elsewhere.

The flow control module 402 is shown secured to a bottom 420 of housing404. The module 402 comprises a housing 430 defining a transitionchamber 431 with a float valve 432 therein. A flood valve arrangement434 is shown providing for liquid drainage into interior chamber 431from housing bottom 420 through aperture arrangement 433. The floodvalve arrangement 434 can be an umbrella valve as shown, althoughalternatives are possible.

The housing 430 has a bottom 435 with a liquid drain arrangement 436therein. Drainage to outlet 437 is provided by a transition chamberdrain liquid arrangement 436 managed by transition chamber drain controlvalve arrangement 438. In the example depicted, the valve arrangement438 is another umbrella valve in this instance over aperture arrangement438 a, although alternatives are possible.

At 440 a low pressure side tap or outlet from housing 430 is depicted,along with valve seat 440 x.

The low pressure side tap or outlet 440 generally comprises a projectionhaving a conduit therethrough, projecting upwardly into an interior ofhousing 404. Preferably it projects to a location at least 5 mm usuallyat least 8 mm and often at least 10 mm above a bottom 420 of housing403. Also, preferably, the projection defining tap 440 extends upwardlyto a location surrounded by the media 412. In the example depicted, theprojection 440 p projects into recess 416 r.

Valve member 432 includes a valve head 432 x thereon. The valve head 432x is configured so that as the valve member 432 rises within chamber431, the valve head 432 x will eventually engage seat 440 x, inhibitinggas flow outwardly through outlet 440. It is also noted that tap oroutlet 440 is configured in gas flow communication with a region ofhousing 404 at a downstream side of the cartridge 407 and at a locationabove a likely level of collected liquid within housing bottom 420.

At 445, a second gas flow conduit or tap is provided as a higherpressure side gas low inlet to housing 430. Tap 445 can be in directcommunication with a gas flow inlet 410 if desired. For the particularexample depicted, however, tap 445 receives gas flow downwardly from abottom end of the media 412 as the gases flow across the media 412 froman inner perimeter 412 i to an outer perimeter 412 p during filtering.Since the outlet for gas flow from the media 411 depicted at 446 is notall the way to the outer perimeter 412 p, gas pressure at tap 446 willbe higher than at outlet region 411. This will provide the restrictedpilot flow and pressure differential for a desirable operation of theassembly 402. Although alternatives are possible, typically, the tap 446will be positioned for gas flow therethrough underneath the media 412 ata location less than 50% of a distance across the media 412 from innerperimeter 412 i to outer perimeter 412 p; i.e. from an upstream side toa downstream side in normal gas flow.

In operation, as the gases flow through the media 412 from in-to-out,coalescing occurs. The collected liquid drains to region 420 and throughinlet aperture 433 or drain aperture, controlled by umbrella valve 434,into transition chamber 431 of housing 430. This will cause the valvemember 432 to float. When the valve member 432 floats sufficiently toclose seat 440 x, gas entry at aperture 445 will allow the pressurewithin interior 431 to rise sufficiently, to obtain liquid flow throughaperture arrangement 438 a managed by valve arrangement 438. Should anycoalesced liquid drain through aperture 445, it will simply enterchamber 431.

C. Another Variation, FIG. 22

In FIG. 22, another variation of the application and principlesaccording to the present disclosure is provided, by assembly 450. Ingeneral terms, assembly 450 comprises a gas/liquid separator arrangement451 having a flow control module 452 in accord with the presentdisclosure mounted thereon. The particular gas/liquid separator assembly451 depicted, comprises a crankcase ventilation filter assembly 453,although alternatives are possible.

In general, the crankcase ventilation filter assembly 453 comprises ahousing 454 including removable service cover 455. The housing 454defines: a gas flow outlet 456, gas flow inlet 457 and a collectedliquid drain outlet 458, positioned in a bottom 454 b of the housing454.

The housing 454 defines an interior 454 i in which is positioned aserviceable filter cartridge 460. By “serviceable” in this context,again, it is meant that the cartridge 460 is removable and replaceablewith respect to the housing 454.

Referring to FIG. 22, the serviceable filter cartridge 460 comprisesmedia 461 surrounding and defining an open filter interior 462. Themedia 461, then, defines a media inner perimeter 461 i and a media outerperimeter 461 p. As will be understood from further description below,the assembly 450 is configured, so that the media 461 filters the gasesand coalesces oil(s), as the gases pass from the media outer perimeter461 p to the media inner perimeter 461 i.

For the particular cartridge 460 depicted, the media 461 is positionedaround central support 464 in extension between opposite end pieces 465,466. End piece 465 is an upper end piece, with central aperture 465 atherethrough. End piece 466 is a lower end piece, with open centralaperture 466 a therethrough. Apertures 465 a, 466 a, provide forcommunication with open central interior 460 o surrounded by media 461.

In operation, gas flow enters housing 454 through inlet 457. Sealarrangement 467 on the cartridge 460 (in the example shown on end piece465) in engagement with the housing 454, defines an inlet gases annulusor region around (higher pressure region) the outside of the media pack461. The gases flow through the media 461, with filtering and coalescingliquid. The filtered gases reach interior 462 then pass upwardly throughend piece 465 through regulator valve arrangement 470 and into the gasflow outlet 456. Liquid which is coalesced within the media 461 drops tohousing bottom 454 b and eventually drains from the housing 454 throughdrain 458.

The liquid, as it reaches housing bottom 454 b, will generally haveeither passed completely through the media pack 461 (i.e. outwardlythrough inner perimeter 461 i) or downwardly through the lower end piece466 via drain arrangement 471 through end piece 466 under media 461.

The gases from outlet 456 can be directed into an air induction system(for a closed or CCV system) or can be vented elsewhere, for example tothe atmosphere (for an open or OCV system).

Attention is now directed to the flow control module 452. As the liquidenters drain 458 it is directed into the module 452.

Flow control module 452 comprises a housing 475 defining a transitionchamber 476. Beneath the transition chamber 476, the housing 475 definesa bottom chamber 477 having a liquid drain outlet 478 associatedtherewith. The bottom wall 476 b of the transition chamber 476 includesa drain aperture 479 therein, with drain flow therethrough managed byone-way transition chamber drain control valve arrangement 480, in thisinstance comprising an umbrella valve, although alternatives arepossible.

The housing 452 further defines an inlet or flood arrangement 482 inliquid flow communication with drain 458, and providing for flow ofliquid, selectively, into an interior of transition chamber 476. Flowthrough flood aperture or aperture arrangement 482 is managed by one-waytransition chamber flood valve arrangement 483, in the example depictedcomprising an umbrella valve, although alternatives are possible.

Positioned within transition chamber 476 is float valve 485 having ahead 486 sized to engage valve seat 490 x in selected operation.

Still referring to FIG. 22, at 490 is provided a low pressure sideoutlet tap for the flow control module 452. The outlet tap 490 comprisesa conduit projection 490 p that projects into an interior of the housing454 to a location above a likely height of collected oil within bottom454 b in use. Entry to the tap 490 from the chamber 476 is provided withvalve seat 490 x. The valve seat 490 x is configured relative to thehead 496 so that as the float member 445 rises, it will eventuallyengage valve seat 490 x inhibiting gas flow through tap 490.

Projection 490 p generally extends upwardly from housing bottom 454 b atleast 5 mm usually at least 8 mm and often at least 10 mm. For theexample depicted, conduit projection 490 p projects upwardly to alocation surrounded by the media 461. For the example depicted,projection 490 p extends through aperture 466 a in lower end piece 466.

Still referring to FIG. 22, at 492 a high pressure side tap providingfor gas flow communication with transition chamber 476 is provided.

The high pressure side gases to the inlet tap 492 are provided byconduit 493. Gas pressure within conduit 493 is provided at gas flow orpressure tap 495.

Gas flow or pressure tap 495 in the example depicted in FIG. 22,receives gases that have flowed partially across media 461 from theouter perimeter 461 p to the inner perimeter 461 i, and outwardlythrough aperture arrangement 455 a in end piece 465 above media 461.Thus, pressure at tap 495 is higher than the pressure at interior 464,which is the region in which tap 490 is in communication. Therefore, thegradient desirable for preferred operation of a liquid control module452 is provided.

Liquid collected on bottom 454 b drains through aperture 458 to inlet482. Under appropriate conditions controlled by valve 483, liquid entersinterior 476. As this occurs, valve 485 begins to float. When enoughliquid has entered transition chamber 476, float valve 485 will haverisen sufficiently for head 486 to engage valve seat 490 x. When thisoccurs, pressure within interior 476 will begin to increase, as a resultof gas flow therein through tap 492. In due course, valve 480 will open,allowing for drainage through aperture 476 of liquid contained withintransition chamber 476 to bottom 477 and drain outlet 478. As with theprevious assemblies, the operation will cycle.

In general terms, the assembly 450 of FIG. 22, can be characterizedrelative to other assembly previously described, as having a cartridge460 with an upper end piece 465 and a gas flow aperture arrangement 495a therethrough at a location partially across the media 461 and inoverlap with an end of the media. That gas flow aperture 495 a is incommunication with a conduit arrangement 493, in the example depictedhaving a portion extending exteriorly to the housing to a high pressureside gas flow tap in communication with internal chamber 476 of a flowcontrol module 452 in accord with the present disclosure.

D. Another Variation, FIG. 23

In FIG. 23, a variation of the assembly depicted in FIG. 22 is provided.The componentry of FIG. 23, to the extent it is analogous to that ofFIG. 22, is numbered analogously except for the overall reference to theassembly of FIG. 23 being assembly 500 comprising gas/liquid separator501 and flow control module 502. Like reference numerals in FIG. 23 toFIG. 22, are intended to represent parts with analogous features,construction and operation.

The principal difference between the assembly 500, FIG. 23 and theassembly 450, FIG. 22, relates the conduit that the gas flow is providedwith from tap 495 (via aperture arrangement 495 a) into the interiortransition chamber 476. Tap 495 is the location at which gas pressuresallow to enter the upstream side tap 510 for the flow control module502. Unlike the arrangement of FIG. 22, the arrangement of FIG. 23 isprovided with a conduit 511 that has a portion that engages tap 410 bypassage through the interior 464 o of the cartridge 460 rather than anexterior of the housing, as shown in FIG. 22. Thus, conduit section 591extends through a central apertures 465 a, 466 a in each end cap 465,466.

Operation of assembly 500, FIG. 23, however, would be analogous tooperation of the assembly of FIG. 22

IV. Schematics Depicting a Varity of Systems

In FIGS. 24-27, a schematic representations of various systems furtherrepresent the wide variety of applications possible using techniquesaccording to the present disclosure. It will be apparent that thetechniques can be applied various systems without specificity as to thedirection of gas flow through a filter cartridge if used; the presenceor absence of regulator valve arrangements; etc.

Referring first to FIG. 24, a system 600 is depicted comprising anengine 601, a gas/liquid separator arrangement 602 and a liquid flowmanagement system 603. The liquid flow management system 603 may be ingeneral accord with arrangements previously discussed, or variationsthereof.

Associated with the engine 601 is depicted in an air induction system604 comprising an air cleaner 605 and turbo 606. The engine 601 isdepicted with a vent 607 for crankcase gases.

The gas/liquid separator assembly 602 depicted comprises a crankcaseventilation filter assembly 610. The assembly 610 comprises a housing611 including a removable service cover 612 and defining an interior 613having a serviceable filter cartridge 615 therein.

The housing 611 defines a gas flow inlet 620 and gas flow outlet 621 anda liquid drain outlet 622.

The cartridge 615 is configured for “out-to-in” flow during filtering.The cartridge comprises media 625 surrounding open interior 626. Sealarrangement 627 is provided for removably sealing the cartridge 625 tothe housing 611 and separating the housing 611 (in conjunction with themedia 625) into an upstream (higher pressure) region and a downstream(lower pressure) region.

In operation, crankcase ventilation gases are directed from outlet 607of the engine 601 into inlet 620 via lines 630. Gases flow into housing611, through cartridge 615 from out-to-in and to interior 626. The gasesthen leave the housing 611 through outlet 621 to line 632. They caneither be directed back into the closed system as indicated in 633 or bevented elsewhere by optional line 634.

The flow control module 603 is generally analogous in feature andoperation to the flow control module described in connection with FIG.3A.

B. FIG. 25

In FIG. 25, a variation in the arrangement depicted in FIG. 24 isdepicted. The principal difference relates to the fact that as the gasflow enters the housing, it is directed through a regulator valvearrangement 651. In other manners, the arrangement 650 of FIG. 25 isanalogous in operation to the arrangement of FIG. 24 and like referencenumerals are used for parts of analogous function and operation.

C. The Arrangement of FIG. 26

Still another variation is depicted in FIG. 26 at system 700. The system700 comprises an engine arrangement 701, a gas/liquid separatorarrangement 702 and flow control module 703.

The engine 701 generally comprises a air induction arrangement 704including an air cleaner 705 and turbo 706. The engine 701 includes acrankcase vent 707 from which crankcase gases leave the engine 701.

The gas/liquid separator arrangement 702 depicted, comprises a crankcaseventilation filter assembly 710, although alternatives are possible. Theassembly 710 comprises a housing 711 having gas flow inlet 712, gas flowoutlet 713 and liquid drain outlet 714.

The housing 711 includes a service cover 717 removably positionedthereon.

Positioned within an interior 7111 of housing 711 is provided as aserviceable filter cartridge 720. The cartridge 720 comprises media 721surrounding and defining an open filter interior 722. The cartridge 720has an upper, open, end piece 723 and a lower, closed, end piece 724.The media 721 is positioned between the end pieces 723, 724.

The cartridge 720 is configured for “in-to-out” flow during operation.In general, then, operation of assembly 700 is with gases from outlet707 transferred via line 725 to inlet 712. The gases pass through thecartridge 720 to outlet 713. From there they are directed via line 726back into the assembly or vented to the atmosphere via line 727.

Liquid which collects within the housing 711 is drained via line 714 tothe flow control module 703 which can generally be in accord with thearrangements previously described. Various pressure line and drains forthe flow control module 703 can be as previously described herein.

D. FIG. 27

In FIG. 27, a system 750 analogous to that of FIG. 26 is depicted, at750, except configured with a gas regulator valve arrangement 751 at thegas flow outlet. In FIG. 27, analogous reference numerals to those usedin FIG. 27, for related features are shown.

V. Additional Comments Regarding Component Materials and Assembly A. TheFilter Cartridge

In general, the filter cartridge (when the invention involves acrankcase ventilation filter assembly) can be assembled using techniquesand materials as described in previously incorporated references: PCT WO2007/053411 A2; WO 2008/147585 A2; WO 2008/115985 A2; WO 2008/157251 A2;WO 2009/018454 A2; U.S. Ser. No. 61/425,869; U.S. Ser. No. 61/503,008;and, in U.S. Ser. No. 61/503,063. Variations from these may relate tospecific locations of apertures in the end pieces, to accomplish theintended results of the present application.

A variety of types of seals can be positioned on the cartridges,including molded-in-place seal members and/or preform seal membersattached to the filter cartridge. In some instances, o-rings can beused.

Specific features relating the filter cartridge can be as appropriatefor the overall filter assembly involved. However, the filter cartridgemay be adapted for operational connection with the flow control moduleas described herein.

B. The Float Valve within the Transition Chamber

The float valve positioned within the transition chamber should beconfigured to have appropriate weight/density characteristics, for theintended cycling as liquid flows into or out of the internal chamber.This is a matter of selecting the material for the float, and ensuringthe appropriate density-type characteristics of the float. Typically,the float valve will be made from plastic, although alternativematerials are usable.

C. The Second Gas Flow Conduit or Pilot Aperture

Typically, the assembly is configured so that the flow rate through thesecond gas flow conduit or pilot aperture into the internal chamber, canoccur at a rate between about 0.5 and 10 liters per minute, typicallybetween 50 and 1,000 milliliters per minute. Alternatives are possible.

D. The Media Providing Restriction to the Port (Second Gas FlowAperture)

The media positioned over the second gas flow aperture will typically bea porous, fibrous, material is appropriate integrity for the intendeduse. Materials similar to these used for the filter cartridge (ifpresent) can be used.

E. The Housing Materials

Typical housing materials for each of the filter control module and theseparator can be plastics or metals, as used in crankcase ventilationfilter assemblies described in the art discussed herein. An exampleplastic is polyomide 66 filled with fiberglass.

Typically, the flow central module will be constructed to withstandpressure of ±20,000 Pa, although alternatives are possible.

VI. General Observations and Principles

According to the present disclosure, features, principles and techniquesare described, applicable to manage liquid flow control of liquidcollected from crankcase ventilation gases and separated via agas/liquid separator assembly. The management of flow control isgenerally from a region of lower pressure, to a region of higherpressure. The region of lower pressure is often a region associated witha region of separation of the gas/liquid separator assembly; and, theregion of higher pressure is often a region associated with a enginecrankcase. Alternatives are possible.

In accord with the present disclosure, a selected ones of theprinciples, features, techniques, components and methods relate to theliquid flow control arrangement itself. Examples are described in whichthe flow control arrangement comprises a housing defining a transitionchamber having a transition chamber interior and comprising a sidewalland transition chamber bottom. The transition chamber includes atransition chamber liquid drain outlet aperture arrangement configuredfor drainage of liquid from an interior of the transition chamber.

The flow control arrangement includes a transition chamber one-waydrainage valve arrangement positioned to control liquid drain throughthe transition chamber liquid drain outlet aperture arrangement and fromthe transition chamber. That is, the transition chamber includes a drainvalve arrangement that allows selectively for drainage from thetransition chamber of liquid within the interior of the transitionchamber. The valve arrangement is one-way so that liquid is inhibitedfrom passing into the transition chamber via this path.

A first gas flow tap or conduit is provided in gas flow communicationwith an interior of the transition chamber. The first gas flow conduitor tap generally defines a valve seat positioned within the transitionchamber.

A second gas flow tap or conduit is also provided in flow communicationwith the transition chamber.

A transition chamber one-way flood valve arrangement is positioned tocontrol liquid flow through the liquid flow inlet and into thetransition chamber. That is, liquid flow into the transition chamber ismanaged by a one-way valve arrangement, so that generally liquid isinhibited from leaving the transition chamber via this flow path.

The flow control arrangement includes a transition chamber valvearrangement having a valve member or valve arrangement positioned in thetransition chamber interior and movable upon entrance of sufficientliquid through the liquid flow inlet to the transition chamber orsufficient liquid drain flow from the transition chamber between twopositions. The first position is one in which both the first gas flowconduit and the second gas flow conduit are open. The second position isone in which the valve seat of the first gas flow conduit is inhibitedfrom gas flow therethrough, by the valve arrangement, while the secondgas flow conduit remains open.

The transition chamber one-way flood valve arrangement and thetransition chamber one-way drainage valve arrangement are positioned andconfigured so that:

(a) when the transition chamber valve arrangement is in the firstposition, the one-way valve arrangement is configured to facilitateliquid flow into the transition chamber through the liquid flow inletand the transition chamber one-way drainage valve arrangement isconfigured to inhibit liquid drainage flow from the transition chamber;and,

(b) when the transition chamber valve arrangement is in the secondposition, the one-way valve arrangement is configured to inhibit liquidflow into the transition chamber through the liquid flow inlet and thetransition chamber one-way drainage valve arrangement is configured tofacilitate liquid drainage from the transition chamber.

Generally, in operation the liquid flow control arrangement will cycle,so that: liquid can enter the transition chamber from a low pressureregion; and, as the liquid floods the chamber, the float valve withinthe chamber will rise to seat with the first gas flow outlet. As thisoccurs, pressure within the interior of the transition chamber willincrease, closing the flood valve and opening the drainage valve todrainage of liquid therethrough, into a higher pressure region. Inshort, the transition chamber is a transition chamber for liquid flowbetween higher and lower pressure regions, the transition chamber andvalve being configured to cycle back and forth between circumstancesallowing for this flow.

A variety of example systems usable as the liquid flow controlarrangement are described and depicted. The general principles ofoperation, however, remain the same among the various systems. It isnoted that the liquid flow control arrangement can be configured as amodule, with various valve members and gas and liquid flow conduitarrangements positioned thereon, as a single module. However, this isnot required in all applications and principles according to the presentdisclosure. Further, in some arrangements described, the liquid flowcontrol arrangement can comprise a module secured to the gas/liquidseparator assembly.

In examples described the housing of the liquid flow control arrangementcan define a housing bottom region having housing liquid drain outlettherein and the transition chamber, at a location positioned so that theliquid drain outlet aperture arrangement is configured for liquid flowfrom the transition chamber to the housing bottom region. That is,liquid flow from the transition chamber can be directed to anotherchamber within the housing, if desired.

In some example arrangements described herein, the housing can alsoinclude a higher pressure chamber separated from the transition chamber.In an example, the housing includes a higher pressure chamber, separatedfrom the transition chamber, that includes an upper interior volumeportion in gas flow communication with the second gas flow conduit; and,the lower interior portion in liquid gas flow communication with thehousing bottom region and housing drain liquid outlet.

In arrangements depicted, the transition chamber valve arrangementcomprises a float member. The float member generally includes a head orcap thereon, positioned to engage the valve seat, as liquid rises withinthe interior of the chamber. The float valve member of the transitionchamber valve arrangement is configured with an appropriate density sothat it will rise to engage the valve seat of the first gas flow conduitor tap, when an appropriate amount of liquid has entered the transitionchamber; and, so that it will move out of engagement with valve seat ata selected and desired rate as the pressure within the chamber increasesfrom the second gas flow conduit.

In examples described, the housing defines a liquid flow inlet chamberand the liquid flow inlet to the transition chamber comprises anaperture arrangement in communication between the liquid flow inletchamber and the transition chamber. In some examples, the aperturearrangement in flow communication between the liquid flow inlet chamberand transition chamber is positioned in extension through a sidewall ofthe transition chamber. In certain applications described, the aperturearrangement in flow communication between the liquid flow inlet chamberand the transition chamber is positioned in extension through thetransition chamber bottom.

An example valve arrangement usable as a transition chamber one-wayflood valve arrangement, is an umbrella valve having a valve headpositioned in the transition chamber and over the liquid flow aperture.Alternatives are possible.

In an example depicted, the transition chamber includes a plurality offloat valve guiding ribs therein, positioned along an inside surface ofthe transition chamber sidewall. As described, optionally, the secondgas flow conduit can comprise a port arrangement through the sidewall ofthe transition chamber at a location above a maximum extension of thefloat valve guiding ribs. Alternatives are possible.

In arrangements described, the second gas flow conduit can, optionally,preferably, be a restricted flow port arrangement. By the term“restricted flow” in this context, it is meant that it offersrestriction to flow therethrough, into the transition chamber interior,of gas from a gas pressure region, in association, for example, with ahigher pressure volume. This restriction in the restricted portarrangement can be provided, for example, by having filter mediapositioned over or in the second gas flow conduit, and/or by limitingthe cross-sectional size or flow area of the restricted flow portarrangement. Typically, both are used, although this is not arequirement.

The restricted flow port arrangement, typically has a totalcross-sectional of no greater than 13 sq. mm, usually no greater than 7sq. mm and often no greater than 4 sq. mm. It can comprise a singleaperture having a diameter within the range of 1-2 mm, althoughalternatives are possible.

Typically, the first gas flow conduit in flow communication with aninterior of the transition chamber defines a valve seat at a locationabove a highest likely normal level of liquid in the transition chamber.By the term “highest likely normal level” and variants thereof in thiscontext, reference is meant to the level of liquid within the transitionchamber upon flooding, at the point the transition chamber begins todrain.

Typically, the second gas flow conduit is provided in flow communicationwith an interior of the transition chamber, also at a location of ahighest likely normal level of liquid in the transition chamber.

With respect to the flow control arrangement provided, a variety ofspecific assemblies are depicted and described, as examples. Principlesand features of each can be applied in selected ones of the others, asdesired. Further, there is no specific requirement that an assemblyinclude all of the specific features described, in order to obtain somebenefit according to the present disclosure. The examples do, however,provide general characterizations of desirable features for desirableoperation. Methods of operation and assembly are thus provided.

Also, in accord with the present disclosure, various combinationsincluding a gas/liquid separator assembly and a liquid flow controlarrangement to facilitate liquid flow from the gas/liquid separatorassembly to an engine crankcase are provided. The gas/liquid separatorassembly generally comprises a gas/liquid separator assembly housingdefining a gas flow inlet, a gas flow outlet in a gas/liquid separatorliquid drain outlet. The liquid flow control arrangement may be asgenerally as previously described.

The combination is configured for direction of liquid from thegas/liquid separator assembly through the gas/liquid separator assemblyliquid drain outlet and to the liquid flow inlet to the transitionchamber of liquid flow control arrangement. Operation will be asgenerally previously described.

The housing of the liquid flow control arrangement can be secured to thehousing of the gas/liquid separator assembly. The components can beprovided inseparable, partially separable or completely separable.

In an example arrangement described, the first gas flow conduit in flowcommunication with interior of the transition chamber comprises aconduit projection extending into the housing of the gas/liquidseparator assembly. Typically, it projects to a location above a likelylevel of liquid in the bottom of the gas/liquid separator housing.Usually this amount of extension is at least 5 mm, typically at least 8mm, and often at least 10 mm.

In some example arrangements described, the gas/liquid separatorassembly comprises a crankcase ventilation filter assembly including afilter cartridge removably positioned in an interior of the gas/liquidseparator housing. In selected examples, the filter cartridge comprisesmedia surrounding an open filter interior and positioned between firstand second end pieces.

In certain selected applications, the first gas flow conduit in flowcommunication with interior of the transition chamber comprises aconduit projection extending to a location surrounded by the media ofthe filter cartridge. In some examples, this conduit projection extendsthrough a central aperture in one of the end pieces, and in particular alower end piece.

Arrangements are described in which each one of the first and second endpieces has a central aperture therethrough, and alternative arrangementsare described in which one of the end pieces does not include a centralaperture therethrough.

Examples are described in which the first gas flow conduit includes anextension thereon sufficient for the gas flow conduit to extend throughthe central aperture of both the first and second end pieces. This isindicated for example in FIG. 23.

Typically, the crankcase ventilation filter assembly is divided into anupstream region and an downstream region, by the filter cartridge. Insome examples, the first gas flow conduit which is in flow communicationwith an interior of the transition chamber is also in flow communicationwith a downstream region of the crankcase ventilation filter housing.The second gas flow conduit may be positioned in gas flow communicationwith the upstream region of the crankcase ventilation filter assemblyhousing also. However, in some examples, a gas flow conduit ispositioned in gas flow communication with the filter cartridge at alocation partially across the filter media, i.e. at a location ofpressure between the upstream region of the crankcase ventilation filterhousing and the downstream region of the crankcase ventilation filterassembly housing.

This can be accomplished by providing the filter cartridge with a endpiece having an aperture arrangement overlap with an end of the media.This can operate as a gas tap for higher pressure gases, at lowerpressure gases which can then be transferred via conduit(s) to the flowcontrol arrangement as desired, whether it be to the high pressure sideor the low pressure side, depending on specifics. A variety of examplesare provided.

Also according to the present disclosure, filter cartridges for use incrankcase ventilation filter assemblies are described. These filtercartridges may be specifically adapted for use in a crankcaseventilation filter assembly in which the assembly is used in combinationwith a liquid flow control arrangement in accord with the presentdisclosure. Thus, the cartridge can be configured with featuresspecifically to accommodate: a first low pressure side conduitprojection of the flow control arrangement; and/or, a gas pressuretake-off through an end piece, positioned partially across the mediafrom a media inner region to the media outer region. Such cartridges aredepicted and described, including ones configured for in-to-out flow andones configured for out-to-in flow.

There is no specific requirement that an assembly, method, feature,component or technique include all of the specific example features,characterizations described herein, in order for some benefit accordingto the present disclosure be obtained. Further, many of the features ofany given embodiment can be applied in other embodiments, with analogousadvantages and results.

1. A filter cartridge for use in a crankcase gas ventilation filterassembly; the filter cartridge comprising: (a) filter media positionedin extension between upper and lower end pieces; (i) the filter mediasurrounding a cartridge open central interior; and, (b) a gas aperturearrangement through one of the upper and lower end pieces at a locationin overlap with the filter media.
 2. A filter cartridge according toclaim 1 wherein: (a) the gas aperture arrangement is through the upperend piece.
 3. A filter cartridge according to claim 2 wherein: (a) thecartridge includes a cartridge gas flow conduit secured to the first endcap in gas flow communication with the gas aperture arrangement.
 4. Afilter cartridge according to claim 2 wherein: (a) the cartridge gasflow conduit extends through the cartridge open central interior.
 5. Afilter cartridge according to any claim 1 wherein: (a) the upper andlower end pieces each have a central aperture therethrough, incommunication with the cartridge open central interior.
 6. A filtercartridge according to claim 5 wherein: (a) the gas aperture arrangementis positioned in the upper end piece at a location in overlap with thefilter media and at a location spaced from the central aperture in theupper end piece.
 7. A filter cartridge according to claim 6 wherein: (a)the cartridge includes a cartridge gas flow conduit secured to the firstend cap in gas flow communication with the gas aperture arrangement thatis spaced from the central aperture in the upper end piece.
 8. A filtercartridge according to claim 7 wherein: (a) the gas flow conduit extendsthrough the central aperture in the upper end piece and then through thecentral cartridge open interior.
 9. A filter cartridge according toclaim 8 wherein: (a) the gas flow conduit extends through the centralaperture in the lower end piece. 10.-11. (canceled)
 12. A gas/liquidseparator assembly comprising: (a) a housing defining a housing interiorand having a gas flow inlet; a gas flow outlet; and, a liquid drainoutlet; and, (b) a filter cartridge according to claim 1 operablypositioned in the housing.
 13. A gas/liquid separator assembly accordingto claim 12 wherein: (a) the filter cartridge is in accord with claim 7;and, (b) the housing includes a gas flow tap separate from the gas flowinlet, the gas flow outlet and the liquid drain outlet; and, (c) thecartridge gas flow conduit is in gas flow communication with the gasflow tap. 14.-16. (canceled)
 17. A gas/liquid separator assemblyaccording to claim 13 wherein: (a) the gas flow tap is a tap thatprovides for gas flow entry to a liquid flow control arrangement for usein facilitating liquid flow from a region of first effective pressure toa region of second, higher, effective pressure.
 18. A gas/liquidseparator assembly according to claim 17 wherein: (a) the liquid flowcontrol arrangement comprises: (i) a housing defining a transitionchamber having a transition chamber interior and comprising a sidewalland transition chamber bottom; (A) the transition chamber including atransition chamber liquid drain outlet aperture arrangement configuredfor drainage of liquid from the interior of the transition chamber; (ii)a transition chamber one-way drainage valve arrangement positioned tocontrol liquid drain through the transition chamber liquid drain outletaperture arrangement and from the transition chamber; (iii) a first gasflow conduit in flow communication with the interior of the transitionchamber; the first gas flow conduit defining a valve seat; (iv) a secondgas flow conduit in flow communication with the interior of thetransition chamber; (v) a liquid flow inlet to the transition chamber;(vi) a transition chamber one-way flood valve arrangement positioned tocontrol liquid flow through the liquid flow inlet and into thetransition chamber; (vii) a transition chamber valve arrangementincluding a valve arrangement positioned in the transition chamberinterior and moveable upon: entrance of sufficient liquid through theliquid flow inlet to the transition chamber; and, sufficient liquiddrain flow from the transition chamber, between: (A) a first position inwhich both of the first gas flow conduit and the second gas flow conduitare open; and, (B) a second position in which the valve seat of thefirst gas flow conduit is inhibited from gas flow therethrough while thesecond gas flow conduit remains open; and, (viii) the transition chamberone-way flood valve arrangement and the transition chamber one-waydrainage valve arrangement being configured such that: (A) when thetransition chamber valve arrangement is in the first position: theone-way flood valve arrangement is configured to facilitate liquid flowinto the transition chamber through the liquid flow inlet; and, thetransition chamber one-way drainage valve arrangement is configured toinhibit liquid drainage flow from the transition chamber; and, (B) whenthe transition chamber valve arrangement is in the second position: theone-way flood valve arrangement is configured to inhibit liquid flowinto the transition chamber through the liquid flow inlet; and, thetransition chamber one-way drainage valve arrangement is configured tofacilitate liquid drainage flow from the transition chamber.
 19. Aliquid flow control arrangement for use in facilitating liquid flow froma region of first effective pressure to a region of second, higher,effective pressure; the flow control arrangement comprising: (a) ahousing defining a transition chamber having a transition chamberinterior and comprising a sidewall and transition chamber bottom; (i)the transition chamber including a transition chamber liquid drainoutlet aperture arrangement configured for drainage of liquid from theinterior of the transition chamber; (b) a transition chamber one-waydrainage valve arrangement positioned to control liquid drain throughthe transition chamber liquid drain outlet aperture arrangement and fromthe transition chamber; (c) a first gas flow conduit in flowcommunication with the interior of the transition chamber; the first gasflow conduit defining a valve seat; (d) a second gas flow conduit inflow communication with the interior of the transition chamber; (e) aliquid flow inlet to the transition chamber; (f) a transition chamberone-way flood valve arrangement positioned to control liquid flowthrough the liquid flow inlet and into the transition chamber; (g) atransition chamber valve arrangement including a valve arrangementpositioned in the transition chamber interior and moveable upon:entrance of sufficient liquid through the liquid flow inlet to thetransition chamber; and, sufficient liquid drain flow from thetransition chamber, between: (i) a first position in which both of thefirst gas flow conduit and the second gas flow conduit are open; and,(ii) a second position in which the valve seat of the first gas flowconduit is inhibited from gas flow therethrough while the second gasflow conduit remains open; and, (h) the transition chamber one-way floodvalve arrangement and the transition chamber one-way drainage valvearrangement being configured such that: (i) when the transition chambervalve arrangement is in the first position: the one-way flood valvearrangement is configured to facilitate liquid flow into the transitionchamber through the liquid flow inlet; and, the transition chamberone-way drainage valve arrangement is configured to inhibit liquiddrainage flow from the transition chamber; and, (ii) when the transitionchamber valve arrangement is in the second position: the one-way floodvalve arrangement is configured to inhibit liquid flow into thetransition chamber through the liquid flow inlet; and, the transitionchamber one-way drainage valve arrangement is configured to facilitateliquid drainage flow from the transition chamber.
 20. A liquid flowcontrol arrangement according to claim 19 wherein: (a) the housingfurther defines a housing bottom region having a housing liquid drainoutlet therein; and, (b) the transition chamber is configured with thetransition chamber liquid drain outlet aperture arrangement configuredfor liquid flow from the transition chamber to the housing bottomregion.
 21. A liquid flow control arrangement according to claim 20wherein: (a) the housing further includes a high pressure chamberseparated from the transition chamber and including: (i) an upperinterior volume portion in gas flow communication with the second gasflow conduit; and, (ii) a lower interior portion in liquid and gas flowcommunication with the housing bottom region and housing liquid drainoutlet.
 22. A liquid flow control arrangement according to claim 19wherein: (a) the transition chamber valve arrangement comprises a floatvalve member.
 23. A liquid flow control arrangement according to claim19 wherein: (a) the housing defines a liquid flow inlet chamber; and,(i) the liquid flow inlet to the transition chamber comprises anaperture arrangement in flow communication between the liquid flow inletchamber and the transition chamber.
 24. A liquid flow controlarrangement according to claim 23 wherein: (a) the aperture arrangementin flow communication between the liquid flow inlet chamber and thetransition chamber is positioned in extension through a sidewall of thetransition chamber.
 25. A liquid flow control arrangement according toclaim 23 wherein: (a) the aperture arrangement in flow communicationbetween the liquid flow inlet chamber and the transition chamber ispositioned in extension through a transition chamber bottom. 26.(canceled)
 27. A liquid flow control arrangement according to claim 19wherein: (a) the transition chamber includes a plurality of float valveguiding ribs along an inside surface of the transition chamber sidewall.28. A liquid flow control arrangement according to claim 27 wherein: (a)the second gas flow conduit is in flow communication with an interior ofthe transition chamber by a port arrangement through a sidewall of thetransition chamber at a location above a maximum extension of the floatvalve guiding ribs.
 29. A liquid flow control arrangement according toclaim 19 wherein: (a) the second gas flow conduit is a restricted flowport arrangement.
 30. A liquid flow control arrangement according toclaim 29 wherein: (a) restriction to gas flow through the restrictedflow port arrangement is at least in part provided by a filter mediaarrangement positioned over the second gas flow conduit.
 31. A liquidflow control arrangement according to claim 29 wherein: (a) restrictionto gas flow through the restricted flow port arrangement is at least inpart provided by limiting a cross-sectional size of the restricted flowport arrangement. 32.-34. (canceled)
 35. A liquid filter controlarrangement according to claim 19 wherein: (a) the first gas flowconduit in flow communication with the interior of the transitionchamber defines a valve seat at a location above a highest likely normallevel of liquid in the transition chamber.
 36. A liquid filter controlarrangement according to claim 19 wherein: (a) the second gas flowconduit in flow communication with the interior of the transitionchamber is positioned to communicate with the interior of the transitionchamber at a location above a highest likely normal level of liquid inthe transition chamber.
 37. A combination including a gas/liquidseparator assembly and a liquid flow control arrangement to facilitateliquid flow from the gas/liquid separator assembly to an enginecrankcase; the combination comprising: (a) a gas/liquid separatorassembly comprising: a gas/liquid separator assembly housing defining agas flow inlet, a gas flow outlet, and gas/liquid separator liquid drainoutlet; and, (b) a liquid flow control arrangement comprising: (i) ahousing defining a transition chamber having a transition chamberinterior and comprising a sidewall and transition chamber bottom; (A)the transition chamber including a transition chamber liquid drainoutlet aperture arrangement configured for drainage of liquid from theinterior of the transition chamber; (ii) a transition chamber one-waydrainage valve arrangement positioned to control liquid drain throughthe transition chamber liquid drain outlet aperture arrangement from thetransition chamber; (iii) a first gas flow conduit in flow communicationwith the interior of the transition chamber; the first gas flow conduitdefining a valve seat; (iv) a second gas flow conduit in gas flowcommunication with the interior of the transition chamber; (v) a liquidflow inlet to the transition chamber; (vi) a transition chamber one-wayflood valve arrangement positioned to control liquid flow through theliquid flow inlet and into the transition chamber; (vii) a transitionchamber valve arrangement including a valve arrangement positioned inthe transition chamber interior and moveable upon: entrance ofsufficient liquid through the liquid flow inlet to the transitionchamber; and, sufficient liquid drain flow from the transition chamberbetween: (A) a first position in which both of the first gas flowconduit and the second gas flow conduit are open; and, (B) a secondposition in which the valve seat of the first gas flow conduit isinhibited from gas flow therethrough while the second gas flow conduitremains open; and, (viii) the transition chamber one-way flood valvearrangement and the transition chamber one-way drainage valvearrangement being configured such that: (A) when the transition chambervalve arrangement is in the first position: the one-way flood valvearrangement is configured to facilitate liquid flow into the transitionchamber through the liquid flow inlet; and, the transition chamberone-way drainage valve arrangement is configured to inhibit liquiddrainage flow from the transition chamber; and, (B) when the transitionchamber valve arrangement is in the second position: the one-way floodvalve arrangement is configured to inhibit liquid flow into thetransition chamber through the liquid flow inlet; and, the transitionchamber one-way drainage valve arrangement is configured to facilitateliquid drainage flow from the transition chamber; (c) the combinationbeing configured for direction of liquid from the gas/liquid separatorassembly through the gas/liquid separator assembly liquid drain outletand to the liquid flow inlet to the transition chamber of the liquidflow control arrangement. 38.-52. (canceled)